Maths ncert class 9 chapter 4 exercise 4.2 July 8, 2019 16 32 64 128 Ncert maths class 9 chapter 4 exercise 4.2 solutions Ncert solutions for class 9 maths chapter 4 exercise 4.2 in hindi 9 2 math class 9 High math class 9 chapter 2 Matematika 9 dasaran